Machine foe removing bark from tree sections



(No Model.) 2 she ts-sheet 1.

' T. F. HORN.

MACHINE FOR REMOVING BARK FROM TREE SEGTIONS.

' Patented Dec. 10. 1889.

n. PETERS. Phowmhognphur. wank]; on uv (No Model.) 2 Sheets-Sheet 2.

I T. F. HORN.

MAGHINB FOR REMOVING BARK FROM TREE szcnous. N0. 416,784. Patented Dee.10, 1889..

N PETERS. PMb-Lithognphu. Wauhhgwn. D. C.

. U ITED STATES PATEN THOMAS F. HORN, or LIVERMORE FALLS, ASSIGNOR 'roTHE ()TIsFAiJLs PULP COMPANY, or

PORTLAND, MAINE.

"MACHINE FOR REMOVING'BIARK FROM TREE-SECTIONS.

SPECIFICATION forming part of Letters Patent No. 416,784, dated.December 10,1889. i i l Application filed May 20, 1889. Serial No.311,369. (No model.) l

To all whom it may concern: I 5 Be it known that I, THOMAS F. HORN, a;citizen of the United States, residing at Liverm'oreFalls, in the countyof Androscoggin' and State of Maine, have invented certain; new anduseful Improvements in Machines for Removing Bark from Tree-Sections;and

. I do declare the following to be a full, clear,

and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the: same,reference being had to the accompanying drawings, and to the letters ofreference marked thereon, which form a part of this specification.

My invention relates'to machines for re moving bark from sections oftrees or logs, such as are used in the manufacture of wood; pulp. Thesemachines as they have com: monly been constructed for use inmanufacturing wood pulp have consisted of a revolv: ing cutter withknives fixedin its face and. having in front'of this face a fixed table.

The bolt or section was placed on this table and turned by hand, at thesame time being pressed against the face of the cutter, by whichthe'bark was removed. These bolts were usually of considerable size andweight, and, as they rested in an upright position on the table, beingturned as the cutters removed the bark, the cutters acted on the outersurface, removing the bark at right angles to the base. Thus when thebolts happened to have one end larger than. the other or to bechurn-butted, so oalledyit became necessary to cut downthe larger end tothe size of the smaller end before the bark could be entirely removed.In this manner much material and labor were wasted. Waste also occurredwhen the bolt was rotated by hand by reason of the irregularity of themotion. When so turned by hand, thecutter would remove the outer surfaceby a series of straight cuts, leaving the bolt when finished polygonalin section instead of cylindrical. l

The object of my invention is to avoid this loss of labor and materialand to construct the machine so that the knives will cut parallel withthe surface of the bolt and not parallel with its center. I accomplishthis endjby providing a tilting table or rest in front of the knives onwhich the bolt rest-s;v and by means of which it can be canted toconform to the surface of the wood'. A further improvement in themachine is effected by making this table or rest rotatable, whereby theturning of the bolt is facilitated. My invention consists of the variousfeatures pointed out in the claims. l '60 Theinvention is illustrated inthe accompanying drawings, in Which 'Figu re 1 is a front view ofabarking-machine fitted with my improvement. Fig. 2 is an end view ofthe same. f Fig. 3 is a part plan V of the same; and Fig. 4 is anenlarged, vertical section through a: m of Fig. 3, showing the table orrest. Fig. 5 shows my invention applied to a machine wherein thebolt is"laid horizontally.

A is the cutter, and B the frame, of any form of barking-machine whereinthe bolt is worked in an upright position, a being one of the knives. p

C is a table or rest suitable port the bolts and so hung or; supportedas to tilt or incline out of a horizontal. position, and particularly ina direction at right angles l l to the face of the cutter. Here Iarrangefor this tilting motion by restingthe table 0 on the top of avertical shaft D, the shaft enter-' ing loosely anopening in the hubc,,which is formed on the under side of the table 0. The fit is,sufficiently loose to secure a considerable rocking motion, and the endofthe shaft Y and the surface of the recess in the table are curved toconform to each other. The-two parts are loosely secured together bymeans of a pin a, which passes through the hub and through a slot orlarge opening (2 in. the end of the shaft. This connection forms a uni-I versal joint and enables the table 0 to rock or tilt to a limitedextent in any direction. The

shaft-is provided with means of being rotated,

(here shown as a pair of bevel-gears d and e,

fixed to a counterdirection parallel with the face of the cutter 10oinsiZetOSUP 75 V by means of two trucks or rolls F, pivotedinchairsZ'FQand it is prevented from tilting toward the cutter by a blockor standard J,

placed next to the face of the cutter. As thus supported, the table isonly allowed to tiltin one directionnamely, away from the cutters.

Rolls or stops G G are pivotedin a vertical position at one side of thetable to prevent the bolt from sliding from the table as it rotates.They are here 'shown as two in number, so disposed as to retain thebolt; but any convenient number may be used.

t se viousthat. the beari g J. m ay be replaced by an anti-frictionroll.

In using my improved machine the bolt is placed on end on the table. Asit is then pushed by hand against the face of the outter,it isrotate-dautomatically-and quickly andthe bark is evenly removedfrom thesurfacefleaving the bolt-cylindrical in form. When a chiirn-butted boltis to be treated, it is "placed on the table with t-he'small end down;Asthe bolt is pushed evenly against the faceof'the cutter, the tablerocks outward or away from the cutter, and so remains while the bolt isturning, so that the cutter acts always parallel with the inclinedsurface, leaving the bolt 'conicalin shape.

- By the use of my improvement the efficiency of the machine is greatlyincreased and the material which was formerly wasted is now saved. r

By dispensing with or decreasing the heightofthe bearing J the table canbe tilted toward the cutter, in which case'the bolt could be placed withthe large end down. I prefer to work it, as described, with the smallend down, as there is'then no tendency of the knives to draw the bolttoward the cutter and so remove more than necessary.

Although my invention is designed more particularly to be used onmachines which operate on a bolt held vertically,it can be applied withgood results to machines wherein the bolt is placed on its side. In Fig.5 I

- illustrate such a machine and show the application of my device to it.v J is the machine, and L is the table on which the bolt rests on itsside.

K is my rotating table with its shaft 0 and gear P for rotating it,these parts being constructed in the same manner already described,except that the shaft is held in friction, is created to cause it torotate with said table while being completely under the control of theoperator.

I claim .1. Ina machine for removing bark from tree sections or bolts, arotating table or rest for said bolts, in combination with a cutterco-operating therewith and acting longitudinally on the surface of saidboltto piess it against said table or rest, substantially as shown.

2. In a machine for removing bark, the combinationof a cutter and arotatable table or 'rest for rotating the bolt on its axis in front ofsaid cutter, andguides at the side of said table or rest for retainingsaid bolt thereon, substantially as described,

3. In a machine for removing bark, the combination of a'cu-tteig'arotatable table -'or rest in front of said [cutter for rotating the bolton its own axis, said table or rest being capable of tilting in a planeat right angles to the face of said cutter, substantially as described.

4. In a machine for removing bark from tree-sections, a rotatable tableor rest for receiving the bolt, said table being capable of tilting inaplane at right-angles to the face of the cutter, and anti-frictionbearings for preventing the lateral tilting of said table, substantiallyas described.

5. The table or rest having a recess on its under side, a'rotatableshaft fitting said recess and connected with said tablebya joint orconnection which allows the parts to turn at an angle with each other,substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

THOMAS HORN.

itnesses: E; L. STANWOOD, Jr., S. W. BATES.

